TA的每日心情 | 开心 2022-1-29 15:04 |
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签到天数: 1 天 [LV.1]初来乍到
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是平面的等角对数螺旋么?cst丛书9里有例子,给你个函数算了,a是螺旋增长率,r是起始半径
5 Z" d. @& c$ ^6 ~Dim xxx As Double, yyy As Double,ttt As Double,a As Double,r As Double
; _; B: m' ^4 Q1 M8 e, k0 Fa=0.2218 B% n( u5 L1 l1 O
r=28 L r7 J! J& `9 v. ]' J
For ttt = 0 To 4*pi STEP pi/32
/ g# z. q' A" v xxx=r*exp(a*ttt)*cos(ttt)
3 m' X: C* n5 i/ r# Y E; [ yyy = r*exp(a*ttt)*sin(ttt)
, A. {$ y/ r4 t0 x* B( a1 ] / b' R" q' n2 ?
.LineTo xxx , yyy
$ o3 U1 |; l: R! M e8 @" n: q3 y Next ttt |
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